Rebel produces Bulk Plates and Centering Rings from Aircraft Grade Plywood. Centering Rings and Bulk Plates for Airframes 3.9'' and smaller are 6mm birch aircraft grade plywood, Centering Rings and Bulk Plates for Airframes 6.0'' are 9mm birch aircraft grade plywood, larger are 12mm birch plywood.

Bulkhead Plates (BP) fit inside their Airframe Tubing (PT) while Coupler Bulkhead Plates (CBP) fit inside their Coupler Tubing (CT).

Centering Rings (CR) fit inside their Airframe Tubing while Coupler Centering Rings (CCR) fit inside their Coupler Tubing.

Besides these common sizes Rebel can produce any special BP or CR you need on request up to 1 meter in diameter............